Google Maps, now integrated with Google Local, offers a lot of information about local merchants, but these detailed results typically don't include "overview" information about locations. Wikipedia, by contrast, has great general-information articles about thousands of places throughout the world.
A new service called Placeopedia maps geographic locations in Wikipedia articles onto Google Maps. It's a great feature that bolsters both services. More in today's SearchDay article, Mapping Places in Wikipedia.
Optimising Digital Marketing Campaigns with Search, Social and Analytics
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